Examples of org.apache.qpid.qmf2.common.QmfQuery

org.apache.qpid.qmf2.common.ObjectId
.apache.org/qpid/qmfv2-api-proposal.html>QMF2 API Proposal and the QMF2 protocol that is specified at QMF Map Message Protocol in particular the use of the underscore to specify key names e.g. "_what", "_where", "_object_id", "_schema_id".
This implementation trusts the protocol specification more than the API specification as the underscores are more consistent with the rest of the protocol and the underscored variants are what have been observed when querying the broker ManagementAgent.
A QmfQuery may be constructed as either an "ID" query (to query for a specific ObjectId or SchemaClassId) or a "PREDICATE" query (to query based upon an expression). Note that QMF considers string arguments in boolean expressions to be names of data values in the target object. When evaluating a predicate expression, QMF will fetch the value of the named data item from each candidate target object. The value is then used in the boolean expression. In other words, QMF considers string arguments to be variables in the expression. In order to indicate that a string should be treated as a literal instead, the string must be quoted using the "quote" expression.
Examples
Assume a QmfData type defines fields named "name", "address" and "town". The following predicate expression matches any instance with a name field set to "tross", or any instance where the name field is "jross", the address field is "1313 Spudboy Lane" and the town field is "Utopia":
```
 ["or" ["eq" "name" ["quote" "tross"]] ["and" ["eq" "name" ["quote" "jross"]] ["eq" "address" ["quote" "1313 Spudboy Lane"]] ["eq" ["quote" "Utopia"] "town"] ] ] 
```
Assume a QmfData type with fields "name" and "age". A predicate to find all instances with name matching the regular expression "?ross" with an optional age field that is greater than the value 29 or less than 12 would be:
```
 ["and" ["re_match" "name" ["quote" "?ross"]] ["and" ["exists" "age"] ["or" ["gt" "age" 27] ["lt" "age" 12]] ] ] 
```
The Expression structure is illustrated below in the context of its relationship with QmfQuery. @author Fraser Adams

        try
        {
            System.out.println("** Starting BigPayloadAgentTest a test of basic Agent class functions **");
                
            Connection connection = ConnectionHelper.createConnection(url, "{reconnect: true}");
            _agent = new Agent(this);
            _agent.setVendor("test.com");
            _agent.setProduct("big-payload-agent");


            System.out.println("Agent name: " + _agent.getName());

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        System.out.println("WorkItem type: " + wi.getType());


        if (wi.getType() == METHOD_CALL)
        {
            MethodCallWorkItem item = (MethodCallWorkItem)wi;
            MethodCallParams methodCallParams = item.getMethodCallParams();
            String methodName = methodCallParams.getName();
            ObjectId objectId = methodCallParams.getObjectId();


            QmfData inArgs = methodCallParams.getArgs();
            ObjectId controlAddress = _control.getObjectId();


            if (objectId.equals(controlAddress))
            {
                if (methodName.equals("processPayload"))

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    {
        System.out.println("WorkItem type: " + wi.getType());


        if (wi.getType() == METHOD_CALL)
        {
            MethodCallWorkItem item = (MethodCallWorkItem)wi;
            MethodCallParams methodCallParams = item.getMethodCallParams();
            String methodName = methodCallParams.getName();
            ObjectId objectId = methodCallParams.getObjectId();


            QmfData inArgs = methodCallParams.getArgs();
            ObjectId controlAddress = _control.getObjectId();


            if (objectId.equals(controlAddress))
            {
                if (methodName.equals("processPayload"))
                {
                    System.out.println("Invoked processPayload method");


                    byte[] parameter = inArgs.getValue("parameter");
                    System.out.println("payload size = " + parameter.length);


                    QmfData outArgs = new QmfData();
                    outArgs.setValue("return", parameter);
                    _agent.methodResponse(methodName, item.getHandle(), outArgs, null);
                }
            }
        }
    }

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    public void populateData() throws QmfException
    {
        System.out.println("*** BigPayloadAgentTest creating a control object ***");


        _control = new QmfAgentData(_controlSchema);
        _control.setValue("name", "controller");
        _agent.addObject(_control);
        System.out.println("BigPayloadAgentTest Schema control object added OK");
    }

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    {
        try
        {
            System.out.println("*** Starting Test2 asynchronous Agent discovery using WorkQueue API ***");
                
            BlockingNotifier notifier = new BlockingNotifier();


            Connection connection = ConnectionHelper.createConnection(url, "{reconnect: true}");
            _console = new Console(notifier);
//console.disableAgentDiscovery(); // To miss all notifications this needs done before addConnection()
            _console.addConnection(connection);


            int count = 0;
            while (true)
            {
                notifier.waitForWorkItem();
                System.out.println("WorkItem available, WorkItem count = " + _console.getWorkitemCount());


                WorkItem wi;
                while ((wi = _console.getNextWorkitem(0)) != null)
                {

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        if (wi.getType() == METHOD_CALL)
        {
            MethodCallWorkItem item = (MethodCallWorkItem)wi;
            MethodCallParams methodCallParams = item.getMethodCallParams();
            String methodName = methodCallParams.getName();
            ObjectId objectId = methodCallParams.getObjectId();


            QmfData inArgs = methodCallParams.getArgs();
            ObjectId controlAddress = _control.getObjectId();


            if (objectId.equals(controlAddress))
            {
                if (methodName.equals("processPayload"))
                {

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            if (correlationId.equals("queueStatsHandle"))
            { // If it is (and it should be!!) then it's our queue object Subscription
                List<QmfConsoleData> data = indication.getData();
                for (QmfConsoleData record : data)
                {
                    ObjectId id = record.getObjectId();
                    if (record.isDeleted())
                    { // If the object was deleted by the Agent we remove it from out Map
                        _objects.remove(id);
                    }
                    else

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                    System.out.printf("--ive ");
                }


                if (exchange.hasValue("altExchange"))
                {
                    ObjectId altExchangeRef = exchange.getRefValue("altExchange");
                    QmfConsoleData altExchange = findById(exchanges, altExchangeRef);
                    if (altExchange != null)
                    {
                        System.out.printf("--alternate-exchange=%s", altExchange.getStringValue("name"));
                    }

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        List<QmfConsoleData> bindings = _console.getObjects("org.apache.qpid.broker", "binding");
        List<QmfConsoleData> queues = _console.getObjects("org.apache.qpid.broker", "queue");


        for (QmfConsoleData exchange : exchanges)
        {
            ObjectId exchangeId = exchange.getObjectId();
            String name = exchange.getStringValue("name");


            if (filter.equals("") || filter.equals(name))
            {
                System.out.printf("Exchange '%s' (%s)\n", name, exchange.getStringValue("type"));
                for (QmfConsoleData binding : bindings)
                {
                    ObjectId exchangeRef = binding.getRefValue("exchangeRef");


                    if (exchangeRef.equals(exchangeId))
                    {
                        ObjectId queueRef = binding.getRefValue("queueRef");
                        QmfConsoleData queue = findById(queues, queueRef);


                        String queueName = "<unknown>";
                        if (queue != null)
                        {

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                    System.out.printf("--generate-queue-events=%d ", QmfData.getLong(args.get(QUEUE_EVENT_GENERATION)));
                }
 
                if (queue.hasValue("altExchange"))
                {
                    ObjectId altExchangeRef = queue.getRefValue("altExchange");
                    List<QmfConsoleData> altExchanges = _console.getObjects(altExchangeRef);
                    if (altExchanges.size() == 1)
                    {
                        QmfConsoleData altExchange = altExchanges.get(0);
                        System.out.printf("--alternate-exchange=%s", altExchange.getStringValue("name"));

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Related Classes of org.apache.qpid.qmf2.common.QmfQuery

org.apache.qpid.messaging.util.AddressParser

org.apache.qpid.qmf2.agent.Agent

org.apache.qpid.qmf2.agent.AgentExternal

org.apache.qpid.qmf2.agent.MethodCallParams

org.apache.qpid.qmf2.agent.MethodCallWorkItem

org.apache.qpid.qmf2.agent.QmfAgentData

org.apache.qpid.qmf2.agent.SubscriptionParams

org.apache.qpid.qmf2.common.Handle

org.apache.qpid.qmf2.common.NotifierWrapper

org.apache.qpid.qmf2.common.NullQmfEventListener

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